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t in (-oo:+oo)
7*(2*t-7) = -217 // + 217
7*(2*t-7)+217 = 0
7*(2*t-7)+217 = 0
14*t+168 = 0
14*t+168 = 0
14*t+168 = 0 // - 168
14*t = -168 // : 14
t = -168/14
t = -12
t = -12
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